Acne can be stubborn sometimes. For those stubborn areas, be really generous with the bp and use the AHA to spot treat as well. You could also try icing the area after washing but before applying any treatments.

this is happening to me aswell although I've only been on it for 4 weeks but I keep getting the same spots on one side of my chin they go down then they come back up again exactlyhow your describing. There not cystic but there blind spots and if I even tried to pick them I know I shouldn't but it really hurts ! There's about 5 of them right now all in the same place and they've been popping up and down since I started! So frustrating !